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20 resultsShowing papers similar to Regulatory mechanism of microplastics on arsenic bioavailability in a subtropical estuary, China
ClearClimate warming will alter the impact of microplastics on the bioavailability of arsenic in a subtropical estuary
Researchers incubated sediment from China's Min River estuary under warming conditions with PLA and PET microplastics at different doses, using DGT techniques to measure arsenic bioavailability. High-dose PLA MPs significantly enhanced arsenic bioavailability under warming while low-dose PET MPs inhibited it, demonstrating that climate warming and MP type interact to alter how arsenic mobilizes in estuarine sediments.
The role of microplastics in altering arsenic fractionation and microbial community structures in arsenic-contaminated riverine sediments
The addition of microplastics to arsenic-contaminated riverine sediments altered arsenic fractionation and shifted microbial community structures, with biodegradable plastics producing different effects compared to conventional polymers. The study demonstrates that microplastics can modify the environmental behavior of co-existing toxic metals in sediment ecosystems.
Quantification of the redox properties of microplastics and their effect on arsenite oxidation
Researchers quantified the redox properties of weathered microplastics and found that environmentally aged phenol-formaldehyde microplastics can influence arsenite oxidation, revealing a previously unknown role for microplastics in biogeochemical redox processes.
Marine microplastics enhance release of arsenic in coastal aquifer during seawater intrusion process
Researchers found that marine microplastics carried by seawater intrusion into coastal aquifers enhanced arsenic release from sediments, with negatively charged microplastics competing with arsenate for adsorption sites on iron minerals. The study identifies a new environmental risk from the interaction of two major coastal contaminants.
Effect of microplastics and arsenic on nutrients and microorganisms in rice rhizosphere soil
Researchers investigated how polystyrene and polytetrafluoroethylene microplastics interact with arsenic contamination in rice rhizosphere soil. The study found that microplastics reduced arsenic bioavailability and altered microbial communities, while both pollutants together inhibited key soil enzyme activities and reduced available nitrogen and phosphorus, suggesting combined microplastic-arsenic pollution can impair nutrient cycling and crop growth.
Microplastics and arsenic speciation in edible bivalves from the coast of China: Distribution, bioavailability, and human health risk
This study examined both microplastic and arsenic contamination in oysters and mussels from the Chinese coastline, finding that the two pollutants coexist and interact. Oysters contained about 58 microplastic particles per gram, and the size of microplastics influenced which forms of arsenic were present. The findings highlight food safety concerns, since people who eat shellfish may be exposed to both microplastics and arsenic simultaneously.
Microplastic mediated arsenic toxicity involves differential bioavailability of arsenic and modulated uptake in rice (Oryza sativa L.)
Researchers examined how polyethylene and polylactic acid microplastics interact with arsenic contamination in rice paddies. They found that at low arsenic levels, microplastics actually reduced arsenic uptake by rice plants, but at high arsenic concentrations the combination produced synergistic toxic effects. The study reveals that the interaction between microplastics and heavy metals in agricultural soils is more complex than previously thought and depends heavily on contaminant concentration levels.
Polystyrene and low-density polyethylene pellets are less effective in arsenic adsorption than uncontaminated river sediment
Researchers found that polystyrene and low-density polyethylene microplastic pellets adsorb significantly less arsenic than natural river sediment, suggesting microplastics may actually reduce arsenic mobility when mixed with contaminated sediments.
Influence of microplastics on nutrients and metal concentrations in river sediments
Researchers investigated how microplastics influence nutrient and metal concentrations in river sediments, finding that microplastics alter the distribution of pollutants through their capacity to adsorb contaminants and support biofilm formation on their hydrophobic surfaces.
Arsenic adsorption by carboxylate and amino modified polystyrene micro- and nanoplastics: kinetics and mechanisms
Researchers found that functionalized polystyrene micro- and nanoplastics can adsorb arsenic from water, with carboxylate-modified particles showing higher capacity than amino-modified ones, and that salinity and humic acids inhibit adsorption, confirming microplastics can alter arsenic behavior in ecosystems.
Conventional and biodegradable microplastics affected arsenic mobility and methylation in paddy soils through distinct chemical-microbial pathways
A 98-day paddy soil experiment found that conventional microplastics reduced arsenic in porewater but increased methylated arsenic fractions, while biodegradable microplastics increased both porewater arsenic and methylation, suggesting distinct chemical-microbial pathways affecting arsenic mobility and toxicity.
The mechanism of polystyrene microplastics to affect arsenic volatilization in arsenic-contaminated paddy soils
Researchers investigated how polystyrene microplastics at different concentrations and sizes affect arsenic volatilization in contaminated paddy soils, finding that microplastic addition increased As volatilization by up to 21.8% in highly contaminated soils. The mechanism involved microplastic-driven shifts in bacterial community composition (particularly Proteobacteria, Firmicutes, and Bacteroidetes) and arsM gene expression, alongside changes in arsenic fractionation.
Impact of Microplastics on the Fate and Behaviour of Arsenic in the Environment and Their Significance for Drinking Water Supply
This review highlights a largely overlooked problem: microplastics in the environment can adsorb arsenic — one of the world's most dangerous water contaminants — onto their surfaces and potentially transport it to new locations or make it harder to remove during drinking water treatment. The authors call for urgent research into how the presence of microplastics affects the performance of arsenic removal technologies, since both pollutants now co-occur in water sources globally.
Soil pH has a stronger effect than arsenic content on shaping plastisphere bacterial communities in soil
Soil pH had a stronger influence than arsenic contamination on shaping the bacterial communities colonizing microplastic surfaces (plastisphere) in contaminated soils, highlighting pH as a key driver of plastisphere ecology.
Interactions Between Heavy Metals and Microplastics in Surface Marine Sediments, Chanthaburi River Mouth, Eastern Gulf of Thailand
Researchers assessed heavy metal and microplastic contamination in surface marine sediments from the mouth of Thailand's Chanthaburi River, finding interactions between metal pollutants and plastic particles that affect contaminant bioavailability and ecological risk in estuarine environments.
Exposure to microplastics lowers arsenic accumulation and alters gut bacterial communities of earthworm Metaphire californica
Researchers examined how microplastics interact with arsenic contamination in earthworms and their gut bacteria. They found that microplastics actually reduced arsenic accumulation in earthworm tissues by adsorbing the arsenic and lowering its bioavailability. The study suggests that while microplastics altered gut bacterial communities, their presence may lessen arsenic toxicity in soil organisms by changing how the metal moves through the food chain.
Co-transport of arsenic and micro/nano-plastics in saturated soil
Column experiments found that 100 nm nanoplastic particles reduced arsenic transport in saturated sand by adsorbing arsenic ions, while 5 micron microplastics enhanced arsenic transport through electrostatic adsorption and pore plugging, demonstrating size-dependent and opposing effects of micro- and nanoplastics on co-contaminant mobility.
Polystyrene microplastic alters the redox state and arsenic metabolization in the freshwater bivalve Limnoperna fortunei
Researchers exposed the freshwater mussel Limnoperna fortunei to polystyrene microplastics in combination with arsenic, finding that microplastics altered the bivalve's redox state and interfered with arsenic metabolization pathways. The results suggest microplastics can impair an organism's ability to convert toxic forms of arsenic to less toxic metabolites, worsening arsenic toxicity.
Physicochemical properties of environmental media can affect the adsorption of arsenic (As) by microplastics
Researchers found that microplastics in farmland soil can absorb arsenic, a known carcinogen, and that the amount absorbed depends on soil properties like organic matter content and nutrient levels. This is the first study to examine microplastic-arsenic interactions in natural soil conditions across 12 Chinese provinces. The findings are important for human health because microplastics carrying arsenic in agricultural soil could increase the transfer of this toxic element into food crops.
Effects of arsenic on the transport and attachment of microplastics in porous media
Researchers studied how arsenic, a common groundwater contaminant, affects the movement of microplastics through soil. They found that arsenic in water generally reduced how far microplastics traveled by promoting their attachment to soil particles, though this effect depended on arsenic concentration, water flow speed, and soil moisture levels. The findings help predict how microplastics and heavy metals may interact and spread together in underground water systems.